Manganese phosphating Chemical conversion
A crystalline conversion layer for couplings, threads and related parts in the oil and gas industry.
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It is not added, it is formed.
Manganese phosphating is a chemical conversion treatment: instead of depositing metal on top, the steel surface reacts with the solution and transforms into a crystalline layer. At Dro Pur, we apply this treatment to couplings, threads and related parts.
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Without electric current
The layer forms through a chemical reaction in a hot bath. Unlike chrome plating, it does not involve electrodeposition.
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A crystalline layer
Dark gray manganese phosphate crystals integrated into the part's surface.
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Functional purpose
Its finish is matte and dark: it is applied for its performance, not its appearance.
How it forms, step by step.
The layer is not added from the outside: it forms on the steel surface itself through a sequence of baths.
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01
Cleaning
Degreasing and rinsing: the surface must be free of oils and oxides for a uniform reaction.
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02
Conditioning
A preliminary bath prepares the surface so that fine, uniform crystals form.
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03
Conversion
In the hot manganese phosphate solution, the steel reacts and a crystalline layer grows, bonded to the part.
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04
Oiling
After rinsing and drying, the layer is impregnated with oil, which is retained in its structure.
What we bring to the part.
With manganese phosphating, the thread retains lubricant, reduces the risk of galling during make-up and, once oiled, gains corrosion protection.
Performance depends on surface preparation, layer thickness and the lubricant used.
View Quality and environmentWhere we apply it
Explore the industries-
Couplings
Threaded connections for the oil and gas industry.
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Threads and related parts
Threaded components associated with couplings, according to each part's requirements.
Other uses of the treatment
- Gears and transmission parts
- Engine components
- Bolts and fasteners
- Parts subject to friction
Processing at Dro Pur is subject to an assessment of each part's material, geometry and requirements.
Other processes
Let's assess the treatment
for your part.
Tell us which component you need phosphated and what requirements it must meet. You can attach a drawing, a photo or a specification.